View Full Version : USA Slashes Lead Limit

16th Oct 2008, 16:52
CNN: EPA slashes lead limit in air by 90 percent (http://www.cnn.com/2008/HEALTH/10/16/epa.lead.air.standard.ap/index.html)
EPA slashes amount of lead allowed in air by 90 percent

WASHINGTON (AP) -- The Environmental Protection Agency is setting a new health standard for lead to slash the amount of the toxic metal in the nation's air by 90 percent.

EPA officials, who were under a federal court order to set a new standard by midnight Wednesday, said the new limit would better protect health, especially children.

"Our nation's air is cleaner today than just a generation ago, and last night I built upon this progress by signing the strongest air quality standards for lead in our nation's history," Stephen Johnson, the EPA administrator, said Thursday. "Thanks to this stronger standard, EPA will protect my children from remaining sources of airborne lead."

The new limit -- 0.15 micrograms per cubic meter -- is the first update to the lead standard since 1978, when it helped phase out leaded gasoline. It is ten times lower than the current standard, which was 1.5 micrograms per cubic meter.

The new standard announced on Thursday would require the 16,000 remaining sources of lead, including smelters, metal mines, and waste incinerators, to reduce their emissions..............

16th Oct 2008, 18:42
Lead in the air....so let's get this straight..... they're finally banning guns, right?


16th Oct 2008, 19:48
(Note - paragraph formatting problems caused by obscure browser problem.) No, we use steel shot nowadays, so the guns are safe . . . More importantly to us, it seems to cover 100LL avgas, which has quite a bit of TEL (Tetra-ethyl lead) in it despite being known as LL. It has less than the old 100/130 it replaced, but still has significant lead content. We're supposed to get something called 83/Green someday, but no one seems to have a clear idea of when someday is. Best Regards, Echo Mike

16th Oct 2008, 20:13
Yes, did some more serious posts earlier. ;)

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AVGAS 100LL does still contain a high content of lead when compared to old fashioned 4 Star motor fuel. The "low lead" suffix refers only to how much AVGAS used to contain.

4 Star contained a minimum of 0.05 gm/ltr of lead.

AVGAS 100LL contains up to 0.56 gm/ltr of lead. Note this is 11 times as much.

AVGAS 130/100 used to contain up to 1.28 gm/ltr of lead, or 25 times as much.

Therefore, a gallon of AVGAS 100LL in a ten gallon tank of premium unleaded would appear to have about the same lead content as the old 98 octane rated 4 star. The resulting fuel quality (octane number) might be better than 98 because the base stock is better.

Again, DON'T put leaded fuel through a catalytic convertor, the lead halide salts produced by combustion will coat the platinum matrix and render it useless very quickly.

19th Oct 2008, 23:19
In the US, T. Boone Pickens is promoting CNG (compressed natural gas) as a motor fuel, readily adapted to existing cars & trucks, as an interim fuel until something better comes along.

Even though CNG is very low in emissions (primarily H2O) the EPA claims their usual bureaucratic privilege to approve installations.

One thing I've learned is that it's a quite high octane-equivalence rating, well suited to supercharged engines. Whether it could match 100/130 I'm not sure, and the pressurized tank presents problems all its own, but is anybody doing anything on the aeronautical side?